usr.sbin/kldxref/kldxref.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-4-Clause
   3  *
   4  * Copyright (c) 2000, Boris Popov
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *    This product includes software developed by Boris Popov.
  18  * 4. Neither the name of the author nor the names of any co-contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $FreeBSD$
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/param.h>
  39 #include <sys/endian.h>
  40 #include <sys/exec.h>
  41 #include <sys/queue.h>
  42 #include <sys/kernel.h>
  43 #include <sys/reboot.h>
  44 #include <sys/linker.h>
  45 #include <sys/stat.h>
  46 #include <sys/module.h>
  47 #define FREEBSD_ELF
  48
  49 #include <err.h>
  50 #include <errno.h>
  51 #include <fts.h>
  52 #include <stdbool.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <unistd.h>
  57 #include <machine/elf.h>
  58
  59 #include "ef.h"
  60
  61 #define MAXRECSIZE      (64 << 10)      /* 64k */
  62 #define check(val)      if ((error = (val)) != 0) break
  63
  64 static bool dflag;      /* do not create a hint file, only write on stdout */
  65 static int verbose;
  66
  67 static FILE *fxref;     /* current hints file */
  68
  69 static const char *xref_file = "linker.hints";
  70
  71 /*
  72  * A record is stored in the static buffer recbuf before going to disk.
  73  */
  74 static char recbuf[MAXRECSIZE];
  75 static int recpos;      /* current write position */
  76 static int reccnt;      /* total record written to this file so far */
  77
  78 static void
  79 intalign(void)
  80 {
  81
  82         recpos = roundup2(recpos, sizeof(int));
  83 }
  84
  85 static void
  86 record_start(void)
  87 {
  88
  89         recpos = 0;
  90         memset(recbuf, 0, MAXRECSIZE);
  91 }
  92
  93 static int
  94 record_end(void)
  95 {
  96
  97         if (recpos == 0)
  98                 return (0);
  99         reccnt++;
 100         intalign();
 101         fwrite(&recpos, sizeof(recpos), 1, fxref);
 102         return (fwrite(recbuf, recpos, 1, fxref) != 1 ? errno : 0);
 103 }
 104
 105 static int
 106 record_buf(const void *buf, size_t size)
 107 {
 108
 109         if (MAXRECSIZE - recpos < size)
 110                 errx(1, "record buffer overflow");
 111         memcpy(recbuf + recpos, buf, size);
 112         recpos += size;
 113         return (0);
 114 }
 115
 116 /*
 117  * An int is stored in host order and aligned
 118  */
 119 static int
 120 record_int(int val)
 121 {
 122
 123         intalign();
 124         return (record_buf(&val, sizeof(val)));
 125 }
 126
 127 /*
 128  * A string is stored as 1-byte length plus data, no padding
 129  */
 130 static int
 131 record_string(const char *str)
 132 {
 133         int error;
 134         size_t len;
 135         u_char val;
 136
 137         if (dflag)
 138                 return (0);
 139         val = len = strlen(str);
 140         if (len > 255)
 141                 errx(1, "string %s too long", str);
 142         error = record_buf(&val, sizeof(val));
 143         if (error != 0)
 144                 return (error);
 145         return (record_buf(str, len));
 146 }
 147
 148 /* From sys/isa/pnp.c */
 149 static char *
 150 pnp_eisaformat(uint32_t id)
 151 {
 152         uint8_t *data;
 153         static char idbuf[8];
 154         const char  hextoascii[] = "0123456789abcdef";
 155
 156         id = htole32(id);
 157         data = (uint8_t *)&id;
 158         idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
 159         idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
 160         idbuf[2] = '@' + (data[1] & 0x1f);
 161         idbuf[3] = hextoascii[(data[2] >> 4)];
 162         idbuf[4] = hextoascii[(data[2] & 0xf)];
 163         idbuf[5] = hextoascii[(data[3] >> 4)];
 164         idbuf[6] = hextoascii[(data[3] & 0xf)];
 165         idbuf[7] = 0;
 166         return (idbuf);
 167 }
 168
 169 struct pnp_elt
 170 {
 171         int     pe_kind;        /* What kind of entry */
 172 #define TYPE_SZ_MASK    0x0f
 173 #define TYPE_FLAGGED    0x10    /* all f's is a wildcard */
 174 #define TYPE_INT        0x20    /* Is a number */
 175 #define TYPE_PAIRED     0x40
 176 #define TYPE_LE         0x80    /* Matches <= this value */
 177 #define TYPE_GE         0x100   /* Matches >= this value */
 178 #define TYPE_MASK       0x200   /* Specifies a mask to follow */
 179 #define TYPE_U8         (1 | TYPE_INT)
 180 #define TYPE_V8         (1 | TYPE_INT | TYPE_FLAGGED)
 181 #define TYPE_G16        (2 | TYPE_INT | TYPE_GE)
 182 #define TYPE_L16        (2 | TYPE_INT | TYPE_LE)
 183 #define TYPE_M16        (2 | TYPE_INT | TYPE_MASK)
 184 #define TYPE_U16        (2 | TYPE_INT)
 185 #define TYPE_V16        (2 | TYPE_INT | TYPE_FLAGGED)
 186 #define TYPE_U32        (4 | TYPE_INT)
 187 #define TYPE_V32        (4 | TYPE_INT | TYPE_FLAGGED)
 188 #define TYPE_W32        (4 | TYPE_INT | TYPE_PAIRED)
 189 #define TYPE_D          7
 190 #define TYPE_Z          8
 191 #define TYPE_P          9
 192 #define TYPE_E          10
 193 #define TYPE_T          11
 194         int     pe_offset;      /* Offset within the element */
 195         char *  pe_key;         /* pnp key name */
 196         TAILQ_ENTRY(pnp_elt) next; /* Link */
 197 };
 198 typedef TAILQ_HEAD(pnp_head, pnp_elt) pnp_list;
 199
 200 /*
 201  * this function finds the data from the pnp table, as described by the
 202  * the description and creates a new output (new_desc). This output table
 203  * is a form that's easier for the agent that's automatically loading the
 204  * modules.
 205  *
 206  * The format output is the simplified string from this routine in the
 207  * same basic format as the pnp string, as documented in sys/module.h.
 208  * First a string describing the format is output, the a count of the
 209  * number of records, then each record. The format string also describes
 210  * the length of each entry (though it isn't a fixed length when strings
 211  * are present).
 212  *
 213  *      type    Output          Meaning
 214  *      I       uint32_t        Integer equality comparison
 215  *      J       uint32_t        Pair of uint16_t fields converted to native
 216  *                              byte order. The two fields both must match.
 217  *      G       uint32_t        Greater than or equal to
 218  *      L       uint32_t        Less than or equal to
 219  *      M       uint32_t        Mask of which fields to test. Fields that
 220  *                              take up space increment the count. This
 221  *                              field must be first, and resets the count.
 222  *      D       string          Description of the device this pnp info is for
 223  *      Z       string          pnp string must match this
 224  *      T       nothing         T fields set pnp values that must be true for
 225  *                              the entire table.
 226  * Values are packed the same way that other values are packed in this file.
 227  * Strings and int32_t's start on a 32-bit boundary and are padded with 0
 228  * bytes. Objects that are smaller than uint32_t are converted, without
 229  * sign extension to uint32_t to simplify parsing downstream.
 230  */
 231 static int
 232 parse_pnp_list(const char *desc, char **new_desc, pnp_list *list)
 233 {
 234         const char *walker, *ep;
 235         const char *colon, *semi;
 236         struct pnp_elt *elt;
 237         char *nd;
 238         char type[8], key[32];
 239         int off;
 240
 241         walker = desc;
 242         ep = desc + strlen(desc);
 243         off = 0;
 244         nd = *new_desc = malloc(strlen(desc) + 1);
 245         if (verbose > 1)
 246                 printf("Converting %s into a list\n", desc);
 247         while (walker < ep) {
 248                 colon = strchr(walker, ':');
 249                 semi = strchr(walker, ';');
 250                 if (semi != NULL && semi < colon)
 251                         goto err;
 252                 if (colon - walker > sizeof(type))
 253                         goto err;
 254                 strncpy(type, walker, colon - walker);
 255                 type[colon - walker] = '\0';
 256                 if (semi != NULL) {
 257                         if (semi - colon >= sizeof(key))
 258                                 goto err;
 259                         strncpy(key, colon + 1, semi - colon - 1);
 260                         key[semi - colon - 1] = '\0';
 261                         walker = semi + 1;
 262                 } else {
 263                         if (strlen(colon + 1) >= sizeof(key))
 264                                 goto err;
 265                         strcpy(key, colon + 1);
 266                         walker = ep;
 267                 }
 268                 if (verbose > 1)
 269                         printf("Found type %s for name %s\n", type, key);
 270                 /* Skip pointer place holders */
 271                 if (strcmp(type, "P") == 0) {
 272                         off += sizeof(void *);
 273                         continue;
 274                 }
 275
 276                 /*
 277                  * Add a node of the appropriate type
 278                  */
 279                 elt = malloc(sizeof(struct pnp_elt) + strlen(key) + 1);
 280                 TAILQ_INSERT_TAIL(list, elt, next);
 281                 elt->pe_key = (char *)(elt + 1);
 282                 elt->pe_offset = off;
 283                 if (strcmp(type, "U8") == 0)
 284                         elt->pe_kind = TYPE_U8;
 285                 else if (strcmp(type, "V8") == 0)
 286                         elt->pe_kind = TYPE_V8;
 287                 else if (strcmp(type, "G16") == 0)
 288                         elt->pe_kind = TYPE_G16;
 289                 else if (strcmp(type, "L16") == 0)
 290                         elt->pe_kind = TYPE_L16;
 291                 else if (strcmp(type, "M16") == 0)
 292                         elt->pe_kind = TYPE_M16;
 293                 else if (strcmp(type, "U16") == 0)
 294                         elt->pe_kind = TYPE_U16;
 295                 else if (strcmp(type, "V16") == 0)
 296                         elt->pe_kind = TYPE_V16;
 297                 else if (strcmp(type, "U32") == 0)
 298                         elt->pe_kind = TYPE_U32;
 299                 else if (strcmp(type, "V32") == 0)
 300                         elt->pe_kind = TYPE_V32;
 301                 else if (strcmp(type, "W32") == 0)
 302                         elt->pe_kind = TYPE_W32;
 303                 else if (strcmp(type, "D") == 0)        /* description char * */
 304                         elt->pe_kind = TYPE_D;
 305                 else if (strcmp(type, "Z") == 0)        /* char * to match */
 306                         elt->pe_kind = TYPE_Z;
 307                 else if (strcmp(type, "P") == 0)        /* Pointer -- ignored */
 308                         elt->pe_kind = TYPE_P;
 309                 else if (strcmp(type, "E") == 0)        /* EISA PNP ID, as uint32_t */
 310                         elt->pe_kind = TYPE_E;
 311                 else if (strcmp(type, "T") == 0)
 312                         elt->pe_kind = TYPE_T;
 313                 else
 314                         goto err;
 315                 /*
 316                  * Maybe the rounding here needs to be more nuanced and/or somehow
 317                  * architecture specific. Fortunately, most tables in the system
 318                  * have sane ordering of types.
 319                  */
 320                 if (elt->pe_kind & TYPE_INT) {
 321                         elt->pe_offset = roundup2(elt->pe_offset, elt->pe_kind & TYPE_SZ_MASK);
 322                         off = elt->pe_offset + (elt->pe_kind & TYPE_SZ_MASK);
 323                 } else if (elt->pe_kind == TYPE_E) {
 324                         /* Type E stored as Int, displays as string */
 325                         elt->pe_offset = roundup2(elt->pe_offset, sizeof(uint32_t));
 326                         off = elt->pe_offset + sizeof(uint32_t);
 327                 } else if (elt->pe_kind == TYPE_T) {
 328                         /* doesn't actually consume space in the table */
 329                         off = elt->pe_offset;
 330                 } else {
 331                         elt->pe_offset = roundup2(elt->pe_offset, sizeof(void *));
 332                         off = elt->pe_offset + sizeof(void *);
 333                 }
 334                 if (elt->pe_kind & TYPE_PAIRED) {
 335                         char *word, *ctx;
 336
 337                         for (word = strtok_r(key, "/", &ctx);
 338                              word; word = strtok_r(NULL, "/", &ctx)) {
 339                                 sprintf(nd, "%c:%s;", elt->pe_kind & TYPE_FLAGGED ? 'J' : 'I',
 340                                     word);
 341                                 nd += strlen(nd);
 342                         }
 343
 344                 }
 345                 else {
 346                         if (elt->pe_kind & TYPE_FLAGGED)
 347                                 *nd++ = 'J';
 348                         else if (elt->pe_kind & TYPE_GE)
 349                                 *nd++ = 'G';
 350                         else if (elt->pe_kind & TYPE_LE)
 351                                 *nd++ = 'L';
 352                         else if (elt->pe_kind & TYPE_MASK)
 353                                 *nd++ = 'M';
 354                         else if (elt->pe_kind & TYPE_INT)
 355                                 *nd++ = 'I';
 356                         else if (elt->pe_kind == TYPE_D)
 357                                 *nd++ = 'D';
 358                         else if (elt->pe_kind == TYPE_Z || elt->pe_kind == TYPE_E)
 359                                 *nd++ = 'Z';
 360                         else if (elt->pe_kind == TYPE_T)
 361                                 *nd++ = 'T';
 362                         else
 363                                 errx(1, "Impossible type %x\n", elt->pe_kind);
 364                         *nd++ = ':';
 365                         strcpy(nd, key);
 366                         nd += strlen(nd);
 367                         *nd++ = ';';
 368                 }
 369         }
 370         *nd++ = '\0';
 371         return (0);
 372 err:
 373         errx(1, "Parse error of description string %s", desc);
 374 }
 375
 376 static int
 377 parse_entry(struct mod_metadata *md, const char *cval,
 378     struct elf_file *ef, const char *kldname)
 379 {
 380         struct mod_depend mdp;
 381         struct mod_version mdv;
 382         struct mod_pnp_match_info pnp;
 383         char descr[1024];
 384         Elf_Off data;
 385         int error, i;
 386         size_t len;
 387         char *walker;
 388         void *table;
 389
 390         data = (Elf_Off)md->md_data;
 391         error = 0;
 392         record_start();
 393         switch (md->md_type) {
 394         case MDT_DEPEND:
 395                 if (!dflag)
 396                         break;
 397                 check(EF_SEG_READ(ef, data, sizeof(mdp), &mdp));
 398                 printf("  depends on %s.%d (%d,%d)\n", cval,
 399                     mdp.md_ver_preferred, mdp.md_ver_minimum, mdp.md_ver_maximum);
 400                 break;
 401         case MDT_VERSION:
 402                 check(EF_SEG_READ(ef, data, sizeof(mdv), &mdv));
 403                 if (dflag) {
 404                         printf("  interface %s.%d\n", cval, mdv.mv_version);
 405                 } else {
 406                         record_int(MDT_VERSION);
 407                         record_string(cval);
 408                         record_int(mdv.mv_version);
 409                         record_string(kldname);
 410                 }
 411                 break;
 412         case MDT_MODULE:
 413                 if (dflag) {
 414                         printf("  module %s\n", cval);
 415                 } else {
 416                         record_int(MDT_MODULE);
 417                         record_string(cval);
 418                         record_string(kldname);
 419                 }
 420                 break;
 421         case MDT_PNP_INFO:
 422                 check(EF_SEG_READ_REL(ef, data, sizeof(pnp), &pnp));
 423                 check(EF_SEG_READ_STRING(ef, (Elf_Off)pnp.descr, sizeof(descr), descr));
 424                 descr[sizeof(descr) - 1] = '\0';
 425                 if (dflag) {
 426                         printf("  pnp info for bus %s format %s %d entries of %d bytes\n",
 427                             cval, descr, pnp.num_entry, pnp.entry_len);
 428                 } else {
 429                         pnp_list list;
 430                         struct pnp_elt *elt, *elt_tmp;
 431                         char *new_descr;
 432
 433                         if (verbose > 1)
 434                                 printf("  pnp info for bus %s format %s %d entries of %d bytes\n",
 435                                     cval, descr, pnp.num_entry, pnp.entry_len);
 436                         /*
 437                          * Parse descr to weed out the chaff and to create a list
 438                          * of offsets to output.
 439                          */
 440                         TAILQ_INIT(&list);
 441                         parse_pnp_list(descr, &new_descr, &list);
 442                         record_int(MDT_PNP_INFO);
 443                         record_string(cval);
 444                         record_string(new_descr);
 445                         record_int(pnp.num_entry);
 446                         len = pnp.num_entry * pnp.entry_len;
 447                         walker = table = malloc(len);
 448                         check(EF_SEG_READ_REL(ef, (Elf_Off)pnp.table, len, table));
 449
 450                         /*
 451                          * Walk the list and output things. We've collapsed all the
 452                          * variant forms of the table down to just ints and strings.
 453                          */
 454                         for (i = 0; i < pnp.num_entry; i++) {
 455                                 TAILQ_FOREACH(elt, &list, next) {
 456                                         uint8_t v1;
 457                                         uint16_t v2;
 458                                         uint32_t v4;
 459                                         int     value;
 460                                         char buffer[1024];
 461
 462                                         if (elt->pe_kind == TYPE_W32) {
 463                                                 memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
 464                                                 value = v4 & 0xffff;
 465                                                 record_int(value);
 466                                                 if (verbose > 1)
 467                                                         printf("W32:%#x", value);
 468                                                 value = (v4 >> 16) & 0xffff;
 469                                                 record_int(value);
 470                                                 if (verbose > 1)
 471                                                         printf(":%#x;", value);
 472                                         } else if (elt->pe_kind & TYPE_INT) {
 473                                                 switch (elt->pe_kind & TYPE_SZ_MASK) {
 474                                                 case 1:
 475                                                         memcpy(&v1, walker + elt->pe_offset, sizeof(v1));
 476                                                         if ((elt->pe_kind & TYPE_FLAGGED) && v1 == 0xff)
 477                                                                 value = -1;
 478                                                         else
 479                                                                 value = v1;
 480                                                         break;
 481                                                 case 2:
 482                                                         memcpy(&v2, walker + elt->pe_offset, sizeof(v2));
 483                                                         if ((elt->pe_kind & TYPE_FLAGGED) && v2 == 0xffff)
 484                                                                 value = -1;
 485                                                         else
 486                                                                 value = v2;
 487                                                         break;
 488                                                 case 4:
 489                                                         memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
 490                                                         if ((elt->pe_kind & TYPE_FLAGGED) && v4 == 0xffffffff)
 491                                                                 value = -1;
 492                                                         else
 493                                                                 value = v4;
 494                                                         break;
 495                                                 default:
 496                                                         errx(1, "Invalid size somehow %#x", elt->pe_kind);
 497                                                 }
 498                                                 if (verbose > 1)
 499                                                         printf("I:%#x;", value);
 500                                                 record_int(value);
 501                                         } else if (elt->pe_kind == TYPE_T) {
 502                                                 /* Do nothing */
 503                                         } else { /* E, Z or D -- P already filtered */
 504                                                 if (elt->pe_kind == TYPE_E) {
 505                                                         memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
 506                                                         strcpy(buffer, pnp_eisaformat(v4));
 507                                                 } else {
 508                                                         char *ptr;
 509
 510                                                         ptr = *(char **)(walker + elt->pe_offset);
 511                                                         buffer[0] = '\0';
 512                                                         if (ptr != NULL) {
 513                                                                 EF_SEG_READ_STRING(ef, (Elf_Off)ptr,
 514                                                                     sizeof(buffer), buffer);
 515                                                                 buffer[sizeof(buffer) - 1] = '\0';
 516                                                         }
 517                                                 }
 518                                                 if (verbose > 1)
 519                                                         printf("%c:%s;", elt->pe_kind == TYPE_E ? 'E' : (elt->pe_kind == TYPE_Z ? 'Z' : 'D'), buffer);
 520                                                 record_string(buffer);
 521                                         }
 522                                 }
 523                                 if (verbose > 1)
 524                                         printf("\n");
 525                                 walker += pnp.entry_len;
 526                         }
 527                         /* Now free it */
 528                         TAILQ_FOREACH_SAFE(elt, &list, next, elt_tmp) {
 529                                 TAILQ_REMOVE(&list, elt, next);
 530                                 free(elt);
 531                         }
 532                         free(table);
 533                 }
 534                 break;
 535         default:
 536                 warnx("unknown metadata record %d in file %s", md->md_type, kldname);
 537         }
 538         if (!error)
 539                 record_end();
 540         return (error);
 541 }
 542
 543 static int
 544 read_kld(char *filename, char *kldname)
 545 {
 546         struct mod_metadata md;
 547         struct elf_file ef;
 548         void **p, **orgp;
 549         int error, eftype;
 550         long start, finish, entries;
 551         char cval[MAXMODNAME + 1];
 552
 553         if (verbose || dflag)
 554                 printf("%s\n", filename);
 555         error = ef_open(filename, &ef, verbose);
 556         if (error != 0) {
 557                 error = ef_obj_open(filename, &ef, verbose);
 558                 if (error != 0) {
 559                         if (verbose)
 560                                 warnc(error, "elf_open(%s)", filename);
 561                         return (error);
 562                 }
 563         }
 564         eftype = EF_GET_TYPE(&ef);
 565         if (eftype != EFT_KLD && eftype != EFT_KERNEL)  {
 566                 EF_CLOSE(&ef);
 567                 return (0);
 568         }
 569         do {
 570                 check(EF_LOOKUP_SET(&ef, MDT_SETNAME, &start, &finish,
 571                     &entries));
 572                 check(EF_SEG_READ_ENTRY_REL(&ef, start, sizeof(*p) * entries,
 573                     (void *)&p));
 574                 orgp = p;
 575                 while(entries--) {
 576                         check(EF_SEG_READ_REL(&ef, (Elf_Off)*p, sizeof(md),
 577                             &md));
 578                         p++;
 579                         check(EF_SEG_READ_STRING(&ef, (Elf_Off)md.md_cval,
 580                             sizeof(cval), cval));
 581                         parse_entry(&md, cval, &ef, kldname);
 582                 }
 583                 if (error != 0)
 584                         warnc(error, "error while reading %s", filename);
 585                 free(orgp);
 586         } while(0);
 587         EF_CLOSE(&ef);
 588         return (error);
 589 }
 590
 591 /*
 592  * Create a temp file in directory root, make sure we don't
 593  * overflow the buffer for the destination name
 594  */
 595 static FILE *
 596 maketempfile(char *dest, const char *root)
 597 {
 598         char *p;
 599         int n, fd;
 600
 601         p = strrchr(root, '/');
 602         n = p != NULL ? p - root + 1 : 0;
 603         if (snprintf(dest, MAXPATHLEN, "%.*slhint.XXXXXX", n, root) >=
 604             MAXPATHLEN) {
 605                 errno = ENAMETOOLONG;
 606                 return (NULL);
 607         }
 608
 609         fd = mkstemp(dest);
 610         if (fd < 0)
 611                 return (NULL);
 612         fchmod(fd, 0644);       /* nothing secret in the file */
 613         return (fdopen(fd, "w+"));
 614 }
 615
 616 static char xrefname[MAXPATHLEN], tempname[MAXPATHLEN];
 617
 618 static void
 619 usage(void)
 620 {
 621
 622         fprintf(stderr, "%s\n",
 623             "usage: kldxref [-Rdv] [-f hintsfile] path ..."
 624         );
 625         exit(1);
 626 }
 627
 628 static int
 629 compare(const FTSENT *const *a, const FTSENT *const *b)
 630 {
 631
 632         if ((*a)->fts_info == FTS_D && (*b)->fts_info != FTS_D)
 633                 return (1);
 634         if ((*a)->fts_info != FTS_D && (*b)->fts_info == FTS_D)
 635                 return (-1);
 636         return (strcmp((*a)->fts_name, (*b)->fts_name));
 637 }
 638
 639 int
 640 main(int argc, char *argv[])
 641 {
 642         FTS *ftsp;
 643         FTSENT *p;
 644         int opt, fts_options, ival;
 645         struct stat sb;
 646
 647         fts_options = FTS_PHYSICAL;
 648
 649         while ((opt = getopt(argc, argv, "Rdf:v")) != -1) {
 650                 switch (opt) {
 651                 case 'd':       /* no hint file, only print on stdout */
 652                         dflag = true;
 653                         break;
 654                 case 'f':       /* use this name instead of linker.hints */
 655                         xref_file = optarg;
 656                         break;
 657                 case 'v':
 658                         verbose++;
 659                         break;
 660                 case 'R':       /* recurse on directories */
 661                         fts_options |= FTS_COMFOLLOW;
 662                         break;
 663                 default:
 664                         usage();
 665                         /* NOTREACHED */
 666                 }
 667         }
 668         if (argc - optind < 1)
 669                 usage();
 670         argc -= optind;
 671         argv += optind;
 672
 673         if (stat(argv[0], &sb) != 0)
 674                 err(1, "%s", argv[0]);
 675         if ((sb.st_mode & S_IFDIR) == 0) {
 676                 errno = ENOTDIR;
 677                 err(1, "%s", argv[0]);
 678         }
 679
 680         ftsp = fts_open(argv, fts_options, compare);
 681         if (ftsp == NULL)
 682                 exit(1);
 683
 684         for (;;) {
 685                 p = fts_read(ftsp);
 686                 if ((p == NULL || p->fts_info == FTS_D) && fxref) {
 687                         /* close and rename the current hint file */
 688                         fclose(fxref);
 689                         fxref = NULL;
 690                         if (reccnt != 0) {
 691                                 rename(tempname, xrefname);
 692                         } else {
 693                                 /* didn't find any entry, ignore this file */
 694                                 unlink(tempname);
 695                                 unlink(xrefname);
 696                         }
 697                 }
 698                 if (p == NULL)
 699                         break;
 700                 if (p->fts_info == FTS_D && !dflag) {
 701                         /* visiting a new directory, create a new hint file */
 702                         snprintf(xrefname, sizeof(xrefname), "%s/%s",
 703                             ftsp->fts_path, xref_file);
 704                         fxref = maketempfile(tempname, ftsp->fts_path);
 705                         if (fxref == NULL)
 706                                 err(1, "can't create %s", tempname);
 707                         ival = 1;
 708                         fwrite(&ival, sizeof(ival), 1, fxref);
 709                         reccnt = 0;
 710                 }
 711                 /* skip non-files and separate debug files */
 712                 if (p->fts_info != FTS_F)
 713                         continue;
 714                 if (p->fts_namelen >= 6 &&
 715                     strcmp(p->fts_name + p->fts_namelen - 6, ".debug") == 0)
 716                         continue;
 717                 if (p->fts_namelen >= 8 &&
 718                     strcmp(p->fts_name + p->fts_namelen - 8, ".symbols") == 0)
 719                         continue;
 720                 read_kld(p->fts_path, p->fts_name);
 721         }
 722         fts_close(ftsp);
 723         return (0);
 724 }